Jason Sadowski
Research Assistant in Condensed Matter Physics
University of Saskatchewan

Address

Rm. 151
Physics Building
116 Science Place
Saskatoon SK
S7N 5E2

Phone: 966-6407
Email: jason.sadowski@usask.ca
Personal Webpage: http://www.jasonsadowski.ca
Supervisor: Dr. Kaori Tanaka


B.Sc. (Engineering Physics) University of Saskatchewan (2009)
M.Sc. (Engineering Physics) University of Saskatchewan (2011)

Project

For years it has been believed that the presence of a charge density wave (CDW) , with insulating behaviour, competes with superconductivity (SC), which leads to zero resistivity. However, in a recent experiment on the type-II superconductor NbSe2 by Kiss et al [1], they have found evidence that a CDW can in fact boost SC in an electron-phonon coupled system. It has been found that portions of the Fermi surface which contribute to the formation of a CDW show the strongest electron-phonon coupling in the SC state. In a subsequent scanning tunnelling spectroscopy (STS) measurement on NbSe2 by Guillamon et al [2] , the local tunnelling density of states (LDOS) has been found to have atomic- scale modulations, which reflect a sixfold anisotropy of the superconducting energy gap related to the CDW vectors in the reciprocal space. This was a surprising result also in the sense that it is generally considered that the LDOS is homogeneous on the atomic scale. The goal of the proposed research is to understand the interplay of CDW, SC, and non-trivial Fermi surface (FS) structure, and explain these intriguing experimental results on NbSe2 .

[1] T. Kiss, T. Yokoya, A. Chainany, S. Shin, T. Hanaguri, M. Nohara, and H. Takagi, Nat. Phys. 3, 720 (2007).
[2] I. Guillamon, H. Suderow, F. Guinea F, S. Vieira , Phys. Review B. 77,134505 (2008).

Conference Posters

Presented at the Dept. of Physics and Engineering Physics Research Days as well as the College of Graduate Studies Poster Expo
Inhomogenous and Multiple-Band Superconductivity

Collaborated on the design and development of the poster
Vortex Structure in a Two-Band Superconductor

Conference Presentations

Second Prize from the Division of Condensed Matter and Materials Physics at the CAP 2010 Congress in Toronto
Nanoscale Inhomogeneity in a Superconductor

Presentation at the 2011 APS March Meeting in Dallas Texas
Interplay of Charge Density Waves and Superconductivity

Papers

Review paper written for PHYS 891: Topics in Photoelectron Spectroscopy
Superconductivity and PES Experiments


Review paper written for PHYS 894: Topics in Theoretical Physics
Interplay of Charge Density Waves and Superconductivity